Digital optical fiber remote system technology

Abstract

The invention relates to a technology of a digital fiber remote radio system. The work flow of a system downlink signal is as follows: a base station signal is sent to a first duplexer by a power divider, and the frequency of the base station signal is converted by a frequency converter; an analog-to-digital conversion unit converts an analog signal into a digital signal; a field programmable gate array performs digital processing on the signal, and a digital optical module modulates and demodulates the signal; the signal is transmitted to the digital optical module to be modulated and demodulated by the optical fiber; then the field programmable gate array performs the digital processing on the signal again; clock guarantee is provided by a main clock unit while the signal is subjected to the digital processing; the processed digital signal is transmitted to a second up converter to convert the frequency by the digital-to-analog conversion unit; the signal is amplified by a power amplifier, transmitted to an omnidirectional antenna by a second duplexer and then emitted. The system also has a work flow of an uplink signal. The technology has the following functions and advantages of digital processing, overpower protection, uplink noise suppression, traffic service detection, improved network coverage quality and smart site selection.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a digital optical fiber remote system technology in a mobile communication system. Background technique [0002] The digital optical fiber remote system adopts digital and optical fiber processing technology to digitize the signal at the near end of the optical fiber, transmit it to the far end through the optical fiber, and use the remote radio frequency unit to regenerate and amplify the signal. The transmission mode between the near end and the far end is digital form. The digital optical fiber remote system is a wireless network coverage technology that effectively realizes remote base station signals. It is mainly composed of two parts: a digital near-end unit (relay terminal) and a digital remote unit (coverage terminal). [0003] Digital optical fiber remote system technology can be divided into broadband digital optical fiber remote technology and frequency-selectiv...

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Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the task of the present invention is to provide an improved digital optical fiber remote system technology, which solves the problem that the traditional repeater uses analog modulation during the transmission process, which will cause problems in the transmission link. The cascading method cannot be realized; the transmission method is limited; and the noise figure of the system will be increased during the transmission process, the system sensitivity will be reduced, and the signal coverage of the sector will be reduced.

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